Final answer:
Neuroblasts differentiate into structures of the central nervous system, arising from the neuroepithelium that forms the neural tube and neural crest, which further give rise to various nervous and non-nervous system structures.
Step-by-step explanation:
Neuroblasts move out of the neuroepithelial layer and differentiate into various structures of the central nervous system. During the development of the embryo, the neural tube serves as the precursor to these central nervous system structures. The neuroepithelium invaginates and separates to form the neural tube. This tube arises from a specialized region of ectodermal tissue known as the neuroectoderm, which undergoes differentiation prompted by specific molecular signals, ultimately becoming the neural plate.
The neural plate, in turn, folds and buckles inward to create the neural groove, bordered by neural folds. When these neural folds converge, the neural tube is formed underneath the ectoderm. Meanwhile, clusters of cells known as neural crest cells break away from the neural folds to migrate and differentiate into not only peripheral nervous system components, such as enteric nervous tissue, but also into non-nervous system structures like the craniofacial cartilage, bone, and melanocytes.